Sickle-bar-holding attachment for grinding-machines.



B. F. CLARK.

SIGKLB BAR HOLDING ATTACHMENT FOB GRINDING MACHINES. APPLICATION FILED MAY 12, 1913.

1, 1 07,033, Patented Aug. 11, 1914.

3 SHEETS-SHEET 1.

wrrnzssgs mvsm-on THE NORRIS PETERS 00., PHOm-LITHQ, WASHINGTON. D. C.

B.F.GLARK. SIGKLE BAR HOLDING ATTACHMENT FOR GRINDING MACHINES. APPLICATION FILED MAY 12, 1913.

Patented Aug. 11, 1914.

3 SHEETS-SHEET 2.

5 W WMM THE NORRIS PETERS 60.. PHOm-LITHQ. WASHINGTON. D. c.

B. F. CLARK. SIGKLB BAR HOLDING ATTACHMENT FOR GRINDING MACHINES. APPLIOATION FILED MAY 12, 1913.

1,107,033. Patented Aug. 11, 1914.

3 SHEETSSHEET 3.

WITNESSES INVENTOR Ihk ADRRIS PETERS CO PHOTO-LITHO., WASHINGTDN. D. C

UNITED STATES PATENT ormon.

BENNETT F. CLARK, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TO THE GARBORUNDUM COMPANY, OF NIAGARA FALLS, NEW YORK, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed May 12, 1913. Serial N0. 766,960.

thereto, the parts being shown in grinding position in dotted lines and in non-grinding position in full lines; Fig. 2 is a plan View of the attachment showing a portion of a sicklebar held therein and with the parts in grinding position; Fig. 3 is a plan view of the attachment with the parts in the position in which they are shown in full lines in Fig. 1; Figs. 4: and 5 are detail sectional views taken respectively on the lines IV-IV and VV of Fig. 3, showing the clamping means; and Figs. 6, 7, 8, 9 and 10 are views similar to Fig. 5 but showing five different modifications.

My invention has relation to work-holding attachments for grinding machines, and more particularly to an attachment designed to hold the sickle or knife bars of a harvesting machine while the cutting edges of the to employ a grinding wheel having double beveled grinding faces, as shown. This wheel is mounted on the shaft 3, and is driven by means of any suitable or usual gearing, not shown, from a shaft 4;. This shaft 4% may be driven either by a hand crank 5 or by treadle levers attached to cranks on the ends of the shaft 1. One of these cranks is shown at 6. Inasmuch as the grinding machine itself forms'no part of my present invention, which may be used in connection with various well known sliding transverse movement on said rod or shaft. In Fig. 3 I have indicated this, the full lines indicating one position of the bracket arm and the parts carried thereby, and the dotted lines indicating another position. The bracket arm 7 is formed at its outer end with the eye or sleeve portions 10, in which is pivotally and slidably supported a rod or shaft 11. Secured to this shaft is the work support. This support is shown as consisting of a longitudinal bar 12 having one or more lugs or ribs 13 at one of its edges to support the rear edge of the sicklebar. The bar 12 also carries two or more bent arms 14 and 15, which terminate in fiat supporting surfaces or pads 16 for the sicklebar. The arm 14 is shown as curved downwardly to a considerably greater extent than the arm 15, this being for the purpose of giving sufiicient room to permit the pitman connection on the cutter bar to pass in by thesupporting surface or pad 16 and thus enable the operator to grind the last blade of the cutter or sickle-bar. The sickle-bar is held against the pad 16 by means of dogs 17 I11 the drawing I have shown three of these dogs. Each of them is pivoted at its lower end to a crank arm 18, rigidly secured to the shaft 11, which, as before stated, is pivotally mounted in its supports in the bracket 7. Each dog is also connected by a pair of links 19 with a lug 20 on the bar 12. The bar 12-is provided at its central portion with a rigid handle projection 21; and the central crank arm 18 adjacent thereto is extended to form a handle member 22. Interposed between these two handle members is a compression spring 23. It will be readily seen that the action of this spring is such as to hold the dogs in the engaging position shown in Figs. 1 and 5. a When the handles 21 and 22 are pressed toward each other, the spring 23 is compressed and the series of dogs'17 are rocked outwardly so as to the operating grips or handles.

permit the insertion, removal, or adjustment of the sickle-bar.

V The operation will be readily understood. The cutter or sickle-bar whose blades are to be sharpened is inserted in the holder and held by the dogs in the manner shown and described. The bracket arm 7 is then swung upwardly into the position shown in dotted lines in Fig. 1, bringing the knives aof the sickle-bar into grinding relation with the bevel faces of the wheelQ. The traversing movement of the entire attachment on the rod or shaft 9, together with the traversing attachment of the work-support on the rod or shaft 11, not only permits the cutter blades to be brought into proper grinding relation with the wheel, but it also permits a number of adjacent blades to be ground without shifting the position of the cutter bar in its support. V

It will be obvious that the work support may be provided with a great variety of different clamps which will be suitable for the purpose. A number of these different forms are shown in Figs. 6 to 10, inclusive. In the form shown in Fig. 6, the dogs 24 are secured to a rocker shaft 25. One of these dogs is extended to form the handle portion 26. A compression spring 27 is interposed between this handle portion and the handle grip 28 on the bar portion 29 of the support. In the form shown in Fig. 7, the dogs 30 are connected at their lower ends to links 31 fastened to the rocker shaft 11 journaled 011 the work support. Connected to one of the dogs is a pivoted handle member 33. A compression spring 34 is interposed between this handle memher and the grip member 35 on the support. In the modification shown in Fig. 8, the dogs are mounted on parallel links 36, one of which links is extended to form a handle portion 37. In this form a tension spring 38 connects the dog with the frame of the support, which normally acts to hold them in engagement. Fig. 9 shows a form in which the dogs 39 are mounted to slide vertically in the support, a compression spring 40 surrounding the shank of each dog between its headed lower end 41. and the frame of the support. 42 and 43 designate Fig. 10 shows another modification, in which a dog 44 is connected at its lower end to a handle member 45 placed below the frame 46 of the sickle or cutter bars to be ground can be readily inserted and removed, and which can be readily manipulated to bring the blades into proper relation to the grinding surface of the grinding wheel.

What I claim is 1. A sickle or cutter bar holding attachment for grinding machines, comprising a support for the bar, said support having a. plurality of clamping members, spring means for holding said members in clamping engagement with the bar, and a single releasing device for said members; substantially as described.

2. A cutter or sickle bar holding attachment for grinding machines, comprising a bracket pivoted to swing toward and away from the grinding wheel, and also mounted for movement in a direction substantially parallel to the axis of the wheel, and a work holder pivotally mounted on said bracket and also capable of movement lou- .gitudinally thereof in addition to its longitudinal movement with the bracket; sub stantially as described.

3. A cutter or sickle bar holding attachment for grinding machines, comprising a bracket pivoted to swing toward and away from the grinding wheel, and also mounted for movement in a direction substantially parallel to the axis of the wheel, and a work holder pivotally mounted on said bracket and also capable of movement lon- 'gitudinally thereof in addition to its longitudinal movement with the bracket, said holder having a plurality of clamping de vices for the bar; substantially as described.

4. A cutter or sickle bar holding attachment for grinding machines, comprising a. bracket pivoted to swing toward and away from the grinding wheel, and also mounted for movement in a direction substantially parallel to the ax1s of the wheel, and a work holder pivotally mounted on said bracket and also capable of movement longitudinally thereof, said holder having a plurality of clamping devices for the bar, spring means for holding said clamping devices in clamping engagement with the bar, and a single releasing means for the clamping devices; substantially as described.

5. A sickle or cutter bar holding attachment for grinding machines having a holdng device plvotally mounted to move toward and away from the grinding surface of the wheel, and also slidably mounted to move 111 a direction parallel to said axis,

said device comprising a plurality of dogs fixed on a common shaft, springs for holding the dogs 1n clampmg position, and a single grip or handle device connected to said shaft and providing means for releasing the dogs; substantially as described.

6. A cutter or sickle bar holdmg attachment for grinding machines, comprising a bracket mounted to swing in a vertical plane toward and away from a grinding wheel, and also to slide longitudinally in a direction parallel with the axis of said wheel, a shaft rotatably mounted in said bracket and also adapted to slide in said bracket in a direction parallel to the axis of the wheel, and holding clamps carried by said shaft; substantially as described.

7. A cutter or sickle bar holding attachment for grinding machines, comprising a bracket pivoted to swing vertically toward and away from a grinding wheel and also to slide in a direction parallel to the axis of said Wheel, a rod or shaft pivotally supported by said bracket and slidable thereon in a direction also parallel to the axis of said wheel, and a work-holder carried by said shaft, said work-holder comprising a plurality of supports and a plurality of clamping dogs for holding the work against said supports, one of said supports being curved away from the plane of the cutter or sickle bar to permit the pitman connection of the latter to pass said supporting surface; substantially as described.

8. A cutter or sickle bar holding attachment for grinding machines, comprising a bracket mounted to swing toward and away from a grinding wheel, a shaft supported by said bracket parallel to the pivotal axis thereof, said shaft also being mounted to slide in said bracket, and a holder'for the cutter or sickle bar carried by said shaft, said holder having a plurality of supports for the bar, and a plurality of movable dogs for holding the bar against said supports; substantially as described.

In testimony whereof, I have hereunto set my hand.

BENNETT F. CLARK. Witnesses:

JAs. H. REYNOLDS, SANFORD MYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

